Use transform to fit slide into browser window

[hb9hnt]

Hi there

For a presentation I used your weenote script but I wanted to use images and svg elements on the slide. Since your fir-function only scale the text size this didn't work for me. So I rewrote the fit function to use css transforms to fit the slide into the browser window.

This has IMHO two advantages:

• It scales whathever element you want to use in a slide, no only text.
• If you use something which isn't text in the fit function, it doesn't result in a infinite loop because the font size doesn't affect the element.

Feel free to ignore my PR, I just thought I'll let you know in case you like my changes. I'm also quite sure that it has downsides that I'm not aware of - even though it worked for my presentation.

Regards

Beni